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From: Peter Korsgaard <peter@korsgaard.com>
To: Ahmad Fatoum <a.fatoum@pengutronix.de>
Cc: barebox@lists.infradead.org, Stafford Horne <shorne@gmail.com>,
	sha@pengutronix.de, Jules Maselbas <jmaselbas@kalray.eu>
Subject: Re: [PATCH v2 02/11] common: introduce bthreads, co-operative barebox threads
Date: Mon, 01 Mar 2021 13:42:07 +0100	[thread overview]
Message-ID: <87im6bqc4g.fsf@dell.be.48ers.dk> (raw)
In-Reply-To: <20210301110106.3764-3-a.fatoum@pengutronix.de> (Ahmad Fatoum's message of "Mon, 1 Mar 2021 12:00:57 +0100")

>>>>> "Ahmad" == Ahmad Fatoum <a.fatoum@pengutronix.de> writes:

Hi,
 
 > +bthreads
 > +--------
 > +
 > +barebox threads are co-operative green threads, which are scheduled whenever
 > +``is_timeout()`` is called.  This has a few implications. First of all,
 > +bthreads are not scheduled when ``is_timeout()`` is not called.
 > +For this and other reasons, loops polling for hardware events should always
 > +use a timeout, which is best implemented with ``is_timeout()``.
 > +Another thing to remember is that bthreads can be scheduled anywhere
 > +in the middle of other device accesses whenever ``is_timeout()`` is
 > +called. Care must be taken that a green thread doesn't access the very same device
 > +again itself. See "slices" below on how devices can safely be accessed from
 > +bthreads.
 > +
 > +Unlike pollers, which bthreads are replacing, bthreads are allowed
 > +access to virtual filesystem. The macro ``assert_command_context()`` is added
 > +to entry points of the VFS to have the thread yield until it may execute in
 > +in the correct context. The poller interface is declared in

s/poller/bthread/

 > +``include/bthread.h``.  ``bthread_create()`` is used to allocate a bthread
 > +control block along with its stack. ``bthread_wake()`` can be used to hang
 > +it into the run queue. From this moment on and until the thread terminates,

s/hang it into/add/

 > +the thread will be switched to regularly as long as someone calls
 > +``is_timeout()``. bthreads are allowed to call ``is_timeout()``, which will
 > +arrange for other threads to execute.
 > +
 > +barebox threads replace previous the previous pollers and workqueues. Poller

s/previous the previous/the previous infrastructure,/

-- 
Bye, Peter Korsgaard

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  reply	other threads:[~2021-03-01 12:43 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-01 11:00 [PATCH v2 00/11] common: introduce bthreads, co-operative Ahmad Fatoum
2021-03-01 11:00 ` [PATCH v2 01/11] console: unconditionally run poller_call in ctrlc() Ahmad Fatoum
2021-03-03 10:20   ` [PATCH] fixup! common: introduce bthreads, co-operative barebox threads Ahmad Fatoum
2021-03-04  8:49     ` Sascha Hauer
2021-03-04  9:17       ` Ahmad Fatoum
2021-03-01 11:00 ` [PATCH v2 02/11] " Ahmad Fatoum
2021-03-01 12:42   ` Peter Korsgaard [this message]
2021-03-02  8:56     ` Ahmad Fatoum
2021-03-02  8:56   ` [PATCH] fixup! " Ahmad Fatoum
2021-03-01 11:00 ` [PATCH v2 03/11] ARM: asm: setjmp: annotate setjmp/longjmp for GCC Ahmad Fatoum
2021-03-01 11:00 ` [PATCH v2 04/11] ARM: asm: setjmp: implement coroutine dependency initjmp() Ahmad Fatoum
2021-03-01 11:01 ` [PATCH v2 05/11] sandbox: asm: implement setjmp/longjmp/initjmp Ahmad Fatoum
2021-03-01 11:01 ` [PATCH v2 06/11] riscv: Add asm/asm.h Ahmad Fatoum
2021-03-01 11:01 ` [PATCH v2 07/11] riscv: Add asm/linkage.h Ahmad Fatoum
2021-03-01 11:01 ` [PATCH v2 08/11] riscv: Implement setjmp/longjmp/initjmp Ahmad Fatoum
2021-03-01 11:01 ` [PATCH v2 09/11] mips: Add linkage.h Ahmad Fatoum
2021-03-01 11:01 ` [PATCH v2 10/11] mips: Implement setjmp/longjmp/initjmp Ahmad Fatoum
2021-03-02 22:19   ` Peter Mamonov
2021-03-04  8:38     ` Sascha Hauer
2021-03-07 12:00       ` Peter Mamonov
2021-03-10  8:17         ` Ahmad Fatoum
2021-03-14 12:40           ` Ahmad Fatoum
2021-03-01 11:01 ` [PATCH v2 11/11] powerpc: Implement initjmp/setjmp/longjmp Ahmad Fatoum
2021-03-03 12:15 ` [PATCH v2 00/11] common: introduce bthreads, co-operative Stafford Horne
2021-03-03 13:35   ` Stafford Horne
2021-03-03 13:58   ` Ahmad Fatoum
2021-03-03 15:12   ` Sascha Hauer

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